ISDN test set



FIG. 1 is an isometric view of the ISDN test set of the present invention, looking from the front and left sides;

FIG. 2 is an isometric view, looking from the back and left sides;

FIG. 3 is a plane view of the front side;

FIG. 4 is an elevational view of the right side;

FIG. 5 is an elevational view of the left side;

FIG. 6 is a plane view of the back side;

FIG. 7 is an elevational view of the bottom end; and,

FIG. 8 is an elevational view of the top end. 

We claim the ornamental design for ISDN test set, as shown. 